Two goals from Saido Berahino and Chris Brunt handed Chelsea their third defeat in 37 games.
Ideye, who replaced Berahino in the 79th minute of the shock win, described the victory as a great one for the Baggies.

The Nigeria star wrote on his twitter page on Tuesday morning: “Great win yesterday.”
Ideye has appeared 24 times for the Midlands team, scoring four goals.
West Brom are 13th in the league table and will face Arsenal in their final league game on Sunday.